import { nextTick } from 'vue';
import * as svg from '@element-plus/icons-vue';

// 获取阿里字体图标
const getAlicdnIconfont = () => {
  return new Promise((resolve, reject) => {
    nextTick(() => {
      const styles: any = document.styleSheets;
      let sheetsList = [];
      let sheetsIconList = [];
      for (let i = 0; i < styles.length; i++) {
        if (styles[i].href && styles[i].href.indexOf('at.alicdn.com') > -1) {
          sheetsList.push(styles[i]);
        }
      }
      for (let i = 0; i < sheetsList.length; i++) {
        for (let j = 0; j < sheetsList[i].cssRules.length; j++) {
          if (
            sheetsList[i].cssRules[j].selectorText &&
            sheetsList[i].cssRules[j].selectorText.indexOf('.icon-') > -1
          ) {
            sheetsIconList.push(
              `${sheetsList[i].cssRules[j].selectorText.substring(1, sheetsList[i].cssRules[j].selectorText.length).replace(/\:\:before/gi, '')}`
            );
          }
        }
      }
      if (sheetsIconList.length > 0) resolve(sheetsIconList);
      else reject('未获取到值，请刷新重试');
    });
  });
};

// 初始化获取 css 样式，获取 element plus 自带 svg 图标，增加了 ele- 前缀，使用时：ele-Aim
const getElementPlusIconfont = () => {
  return new Promise((resolve, reject) => {
    nextTick(() => {
      const icons = svg as any;
      const sheetsIconList = [];
      for (const i in icons) {
        sheetsIconList.push(`ele-${icons[i].name}`);
      }
      if (sheetsIconList.length > 0) resolve(sheetsIconList);
      else reject('未获取到值，请刷新重试');
    });
  });
};

// 初始化获取 css 样式，这里使用 fontawesome 的图标
const getAwesomeIconfont = () => {
  return new Promise((resolve, reject) => {
    nextTick(() => {
      const styles: any = document.styleSheets;
      let sheetsList = [];
      let sheetsIconList = [];
      for (let i = 0; i < styles.length; i++) {
        if (styles[i].href && styles[i].href.indexOf('netdna.bootstrapcdn.com') > -1) {
          sheetsList.push(styles[i]);
        }
      }
      for (let i = 0; i < sheetsList.length; i++) {
        for (let j = 0; j < sheetsList[i].cssRules.length; j++) {
          if (
            sheetsList[i].cssRules[j].selectorText &&
            sheetsList[i].cssRules[j].selectorText.indexOf('.fa-') === 0 &&
            sheetsList[i].cssRules[j].selectorText.indexOf(',') === -1
          ) {
            if (/::before/.test(sheetsList[i].cssRules[j].selectorText)) {
              sheetsIconList.push(
                `${sheetsList[i].cssRules[j].selectorText.substring(1, sheetsList[i].cssRules[j].selectorText.length).replace(/\:\:before/gi, '')}`
              );
            }
          }
        }
      }
      if (sheetsIconList.length > 0) resolve(sheetsIconList.reverse());
      else reject('未获取到值，请刷新重试');
    });
  });
};

/**
 * 获取字体图标 `document.styleSheets`
 * @method ali 获取阿里字体图标 `<i class="iconfont 图标类名"></i>`
 * @method ele 获取 element plus 自带图标 `<i class="图标类名"></i>`
 * @method ali 获取 fontawesome 的图标 `<i class="fa 图标类名"></i>`
 */
const initIconfont = {
  // iconfont
  ali: () => {
    return getAlicdnIconfont();
  },
  // element plus
  ele: () => {
    return getElementPlusIconfont();
  },
  // fontawesome
  awe: () => {
    return getAwesomeIconfont();
  },
};

// 导出方法
export default initIconfont;
